Power shovel



April 26 1927.

J. S. HUBER POWER SHOVEL Filed April 10, 1926 .l TTORNE) S.

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Patented Apr. `26, 1927.

UNITED STATES PATENT OFFICE JOHANNES S. HUBER, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO HARNISCHFEGER l CORPORATION, OF MILWAUKEE, WISCONSIN, CORPORATION OF WISCONSIN.

rowna SHOWI..

Application led April 10, 1926. Serial No. 101,022.

This invention relates to improvements in power shovels of the back-acting or hoe t e.

ylower shovels of the type referred to include a boom and a dipper stick provided at its lower end with an excavating bucket and connected to the upper end of the boom for pivotal or swinging movement in a vertical plane, the boom being pivotally connected to a revolvable frame or table mounted upon a tractor and which supports the mechanism for operating the dipper stick and bucket. These machines are used for various purposes such as the digging of trenches or ditches for pipe lines and for digging cellars and large excavations. In machines of this type constructed heretofore, the dipper stick has been connected to the upper end of the boom for pivotal or swinging movement in a fixed vertical plane. This construction is favorable for the digging of trenches or ditches where it is desirable to keep the dipper stick from swinging laterally out of the vertical'plane in order to finish the sides of the trench or ditch so that the same are parallel and vertical, as well as in the shaping of an excavation to a certain predetermined line. In cellar digging, however, or large excavation work. Where there is no sharp cast-ofi` to be made, it is not necessary, and in fact not advantageous to .keep the dipper stick relatively fixed in the vertical plane, so that in this construction used heretofore the boom and dipper V stick and their associated part-s have been subjected to unnecessary strain due to the frequent tendency of the dipper stick upon sideswipin thereof to twist the boom about its longitu inal axis.

One of the objects of the present invention, therefore, is to provide in a machine of the character described improved means for connecting the boom and dipper stick to permit sideswiping or lateral play of the latter while being constructed so as to permit of the dipper stick being conined to pivotal or swinging movement in a substantially vertical plane when desired.

Other objects and advantages will hereinafter appear.

In the drawings:

Figure 1 is a side elevation of a power shovel of the character referred to, showing the improved means for connecting the boom and dipper stick;

2 is a sect-ion on line 2 2 of Fig. 1;

Fig. 3 is a section'on line 3--3 of Fig. 2;

Fig. 4 is an enlarged, lfragmentary view taken from Fig. 1, showing an improved latch for holding the door or drop bottom of the bucket closed;

Fig. 5 is an end elevation, looking toward the left in Fig. 4; and

Fig. 6 is an enlarged sectional view, taken onthe line 6 6 of Fig. 5.

Referring more particularly to' Figs. 1 to 3, the bloom 1 of the power shovel compr1ses a pair of complementary spaced channel `members 2 and 3 arranged with their lianges extending outwardly and secured together by upper and lower plates 4 .and 5.

l.A casting 6 provided with an opening extending longitudinally of the boom is arranged bet-ween the upper spaced ends of members 2 and 3 and secured thereto by means of rivets or bolts 7, member 6 thereby acting to reinforce the boom at the outer end thereof and to hold the upper adjacent ends of members 2 and 3 in fixed spaced relation. A second member 8 is provided with a hollow shank 9 fitting loosely in the longitudinal opening in member 6, and an enlarged head 10 overhanging the upper end of boom 1 and providing a shoulder 11 which rests against the adjacent end of member 6. A retaining ring 12 is fitted upon the inner end 'of shank 9 and held in place against the adjacent end of member 6 by means of a suitable pin 13, shoulder 11 and ring 12 thereby acting to hold members 6 and 8 against relative axial movement with respect to each other while permitting free rotary movement of member 8 with respect to member 6 about an axis extending longitudinally of boom 1. A third member 14 is ixed rigidly in any suit-able manner to the dipper stick 15 and is provided with spaced lugs or bearings 16, a pin 17 extending through registering openings in bearings 16 and head 10 of member 8 whereby the dipper stick 15 is connected to boom 1 for pivotal movement about an axis transverse to the longitudinal axis of the lat-ter.

For the purpose of holding members 6 and respect to each other when desired, the same may be provided with openings arranged to register to receive a in 18 extending through similar openings 1n plates 4 and 5 and being held in place in any suitable manner such as by cotter pins 19 extending through the ends of pin 18, as more clearly shown in Figs. 2 and 3.

Bumpers or stops may be secured to the upper side of boom land arranged to engage with dipper stick 15 to prevent the latter from contacting 'directly with the boom when tilted in parallel relationwith respect to the latter.

In the digging of trenches or ditches, or where it is desired to shape an excavation to a certain predetermined line, pin 18 is put in place to lock members 6 and 8 against relative rotary movement, whereby the dipper stick 15 is confined to movement in a vertical plane. In digging a large excavation such as a cellar, however, lateral swing ing of the dipper stick from the vertical plane is not ob]ectionable, pin 18 is removed so that upon this sideways swinging or movement of the dipper stick member 8 will rotate in member 6 about the longitudinal axis of the boom, thus relieving the latter from the strain oftwisting which would otherwise occur if member 8 werefixed relatively with respect to the boom, as in the construction used heretofore.

The bucket 21 may be of any suitableJ or preferred construction and is rigidly supported from the lower end of tie dipper stick and is provided withthe usual4 drop bottom or door 22 pivotally connected thereto at 23 and held in closed position by means of a latch 24, the latter being released by means of a lever 25 actuatedv by the trip line 26. The construction and manner of operation of the latch and its associated parts form the subject matter of a separate copending applicatlon. i

One embodiment of the invention has been shown and described, but of course various changes may be made in the size. shape and arrangement of the parts without departing from the spirit of the invention or the scope of the claims.

The invention claimed is:

1. The combination with the boom and dipper stick of a power shovel, of means connecting said dipper stick to said boom for pivotal movement with respect to the latter about an axis extending longitudinally of and fixed relatively with respect Vto the same and for pivotal movement about an axis substantially transverse to said firstnamed axis.

2. The combination with the boom and dipper stick of a power shovel, of a. connection for said parts comprising a member fixed rigidly to said dipper stick, a second member carried by said boom for rotary movement with respect thereto about an axis extending longitudinally of the Same, and a pin connecting said members for pivotal movement with respect to each other same, a pin connecting said members for pivotal movement with respect to each other about an axis substantially transverse to said first-named axis, and means for locking said second member against said rotary movement with respect to said boom.

4. In Aa machine of the character described, a boom, a member fixed to the latter at the outer end thereof and provided with an opening extending longitudmally of the same, a second member fitting loosely in said opening and overhanging said end of the boom, means for holding said members against axial movement with respect to each other while permitting relative rotary movement of the same, a third member fixed rigidly to said dipper stick, and a pinconnecting said third member to the overhang ing portion of said second member for pivotal movement with respect to the latter.

5. In a machine of the character described, a boom, a member fixed to the latter at the outer end thereof and provided with an opening extending longitudinally of the boom, a second member fitting loosely in said opening and overhanging said end of the boom, means for holding said members against axial movement with respect to each other while permitting relative rotary movement of the same, a third member fixed rigidly to said dipper stick, and a pin connecting said third member to the overhanging portion of said second member for pivotal movement with respect to the latter, said first and second members being pro vided with openings arranged to register to receive means for locking the same against said rotary movement.

6. In a machine of the character described, the combination with the dipper stick thereof and a boom comprising a pair of complementary spaced members, of means connecting said boom and stick for universal movement with respect to each other and including a part arranged between and fixed to the outer adjacent ends of said members for holding the same in fixed spaced relation.

7. In a. back-acting shovel, a boom, a dipper stick, an elongated bearing member at the outer end of the boom, and a pin swiveled in said member and pivotally attached to the dipper stick.

8. In a baokacting shovel, a boom, a dipper stick, an elongated bearing member at the outer end of the boom, a pin swiveled in said member and pivotally attached to the dipper stick, and removable means for holding said pin and member against relative rotation.

9. lln a back-acting shovel, a boom, a dipper stick, an elongated bearing member mounted longitudinally of the boom at the outer end thereof, and a pin sWiveled in said bearing member and pivotally Connected to the dipper stick on an axis transverse with respect to that of said bearing member.

l0. In a back-acting shovel, a boom, a dipper stick, an elongated bearing member mounted longitudinally of the. boom at the outer end thereof, a pin swiveled in Said bearing member and pivotally connected to the clipper stick on an axis transverse With respect to that of said bearing member, and means for preventing longitudinal displacement of said pin.

In Witness whereof l hereto ax my signature.

JOHANNES S. HUBER, 

